منابع مشابه
Dinosaur incubation periods directly determined from growth-line counts in embryonic teeth show reptilian-grade development.
Birds stand out from other egg-laying amniotes by producing relatively small numbers of large eggs with very short incubation periods (average 11-85 d). This aspect promotes high survivorship by limiting exposure to predation and environmental perturbation, allows for larger more fit young, and facilitates rapid attainment of adult size. Birds are living dinosaurs; their rapid development has b...
متن کاملRevisiting the Estimation of Dinosaur Growth Rates
Previous growth-rate studies covering 14 dinosaur taxa, as represented by 31 data sets, are critically examined and reanalyzed by using improved statistical techniques. The examination reveals that some previously reported results cannot be replicated by using the methods originally reported; results from new methods are in many cases different, in both the quantitative rates and the qualitativ...
متن کاملEcological modelling, size distributions and taphonomic size bias in dinosaur faunas: reply to Brown et al.
Ecological modelling, size distributions and taphonomic size bias in dinosaur faunas: reply to Brown et al. Understanding dinosaur palaeobiology requires appropriate reconstruction and interpretation of the fossil record. Brown et al. [1] question our interpretation and the modelling approach used [2]. Here we address their concerns. Fossil record. Brown et al. [1] suggest that the observed sca...
متن کاملMultivariate Analyses of Small Theropod Dinosaur Teeth and Implications for Paleoecological Turnover through Time
Isolated small theropod teeth are abundant in vertebrate microfossil assemblages, and are frequently used in studies of species diversity in ancient ecosystems. However, determining the taxonomic affinities of these teeth is problematic due to an absence of associated diagnostic skeletal material. Species such as Dromaeosaurus albertensis, Richardoestesia gilmorei, and Saurornitholestes langsto...
متن کاملFluvial transport potential of shed and root-bearing dinosaur teeth from the late Jurassic Morrison Formation
Shed dinosaur teeth are commonly collected microvertebrate remains that have been used for interpretations of dinosaur feeding behaviors, paleoecology, and population studies. However, such interpretations may be biased by taphonomic processes such as fluvial sorting influenced by tooth shape: shed teeth, removed from the skull during life, and teeth possessing roots, removed from the skull aft...
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ژورنال
عنوان ژورنال: Nature
سال: 1980
ISSN: 0028-0836,1476-4687
DOI: 10.1038/288195a0